Meaning of “strain” - Learner’s Dictionary

strain

noun uk us /streɪn/
FEELING [ C, U ]

B2 a feeling of being worried and nervous about something:

The strain of the last few months had exhausted her.
put a strain on sb/sth

to cause problems for someone or to make a situation difficult:

Children put tremendous strains on a marriage.
INJURY [ C, U ]

an injury to part of your body that is caused by using it too much:

back strain
STRETCH [ U ]

B2 the fact of being pulled or stretched too tightly:

The rope broke under the strain.
DISEASE/PLANT [ C ]

a type of disease or plant:

a new strain of virus

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