trench
The Spanish word 'trinchera' translates to 'trench' in English. It refers to a long, narrow excavation in the ground, the earth from which is often thrown up in front to serve as a shelter from enemy fire or attack in a military context. In a more general context, it may also relate to any situation of intense competition or struggle.
My grandfather fought in the trenches during the war.
This sentence refers to trench warfare, a type of combat in which combatants fight from a system of trenches facing each other. It's commonly used when talking about World War I.
The civilian population is in the trench of the economic crisis.
In this context, trinchera (trench) is used metaphorically to express hardship or struggle, hence its use to describe a tough economic situation.
We are in the trench of the fight against climate change.
In this sentence, 'trinchera' is used metaphorically to indicate that we are in the middle, or at the forefront, of a struggle - in this case the battle against climate change.