under stress

:  in or into a position below or beneath something

:  below or short of some quantity, level, or limit

:  in or into a condition of subjection, subordination, or unconsciousness

:  below or beneath so as to be overhung, surmounted, covered, protected, or concealed by

:  subject to the authority, control, guidance, or instruction of

:  receiving or undergoing the action or effect of

:  lower in rank or authority :  subordinate

:  constraining force or influence: such as

:  a force exerted when one body or body part presses on, pulls on, pushes against, or tends to compress or twist another body or body part

:  the intensity of this mutual force commonly expressed in pounds per square inch

:  to subject to physical or psychological stress

:  to subject to phonetic stress :  accent

:  to lay stress on :  emphasize