All the examples and meanings are taken from Cambridge dictionary. All the words are taken from Cambridge IELTS readings.

• distort

to change the shape of something so that it looks strange or unnatural:

The map distorted Greenland to appear four times its actual size.
a distorting mirror

More examples
With this form of editing you can distort the shape of an object or piece of text.
Her face was distorted by anger.
We are looking at the picture through a distorting lens.

to change something so that it is false or wrong, or no longer means what it was intended to mean:
She accused her opponent of distorting the truth.
The survey methods can distort reality.

to change or affect something, especially in a way that makes it worse:
The government is actually distorting markets and undermining competition.
There’s a danger this could distort his judgment.

to change something from its natural or usual shape or condition:
Agony distorted his face.
There are those who would distort the facts to serve their own political ends.

• discredit

to cause people to stop respecting someone or believing in an idea or person:
Evidence of links with drug dealers has discredited the mayor.

loss of respect for or belief in someone or something:
The stupid behaviour of one student has brought discredit on the whole school.
To her discredit, she never admitted her role in the scandal.

to give people reason to stop believing someone or to doubt the truth of something:
The old Soviet economic model has been thoroughly discredited.
It’s the job of the defense to discredit prosecution witnesses.

• hostile

unfriendly and not liking something:
a hostile crowd
The president had a hostile reception in Ohio this morning.

unfriendly = The crowd was unfriendly and dangerous.
cool = She was very cool towards his new wife.
cold = She’s a cold, heartless woman.
icy = He gave me an icy stare.
glacial = Her reception of him was glacial.

not agreeing with something:
I’m not hostile to (= against) the idea of change as such.

difficult or not suitable for living or growing:
hostile weather conditions
a hostile climate/environment

• abandon

to leave a place, thing, or person, usually for ever:

We had to abandon the car.
By the time the rebel troops arrived, the village had already been abandoned.
As a baby he was abandoned by his mother.
We were sinking fast, and the captain gave the order to abandon ship.

More examples

If disturbed, the bird may abandon the nest, leaving the chicks to die.
It was his instinct for self-preservation that led him to abandon his former friends and transfer his allegiance to the new rulers.
According to an eyewitness account, the thieves abandoned their vehicle near the scene of the robbery and then ran off.
The police are trying to trace the mother of a newborn baby found abandoned outside a hospital.
The house had been abandoned for several years before they decided to demolish it.

to stop doing an activity before you have finished it:

The game was abandoned at half-time because of the poor weather conditions.
They had to abandon their attempt to climb the mountain.
The party has now abandoned its policy of unilateral disarmament.

• triumph

a very great success, achievement, or victory (= when you win a war, fight, or competition), or a feeling of great satisfaction or pleasure caused by this:

The book celebrates the hostages’ remarkable triumph over appalling adversity.
The signing of the agreement was a personal triumph for the prime minister.
It was the Republican Party’s third election triumph in a row.
The eradication of smallpox by vaccination was one of medicine’s greatest triumphs.
The constitutional changes have been hailed as a triumph for democracy.
The game ended in triumph for the home team.
He returned in triumph from the sales with a half-price TV.

More examples

He’s always crowing about his latest triumph.
Saint Augustine’s ‘City of God’ is an allegory of the triumph of Good over Evil.
His tumultuous triumph 5 years ago now seems a mere footnote in history.
His eyes gleamed in triumph.
The victory over the French at Waterloo was Wellington’s greatest triumph.