Meaning of “strain” - Learner’s Dictionary

strain

verb uk us /streɪn/
TRY HARD [ I, T ]

to try hard to do something, usually to see or hear something:

[ + to do sth ] I had to strain to hear the music.
INJURE [ T ]

B2 to injure part of your body by using it too much:

I think I've strained a muscle.
CAUSE PROBLEMS [ T ]

to cause problems for a situation or relationship:

The incident has strained relations between the two countries.
MONEY [ T ]

to cause too much of something to be used, especially money:

The war is straining the defence budget.
SEPARATE [ T ]

to separate solids from a liquid by pouring the mixture into a container with small holes in it:

Strain the sauce to remove the seeds and skins.

(Definition of “strain verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)