Idiom Definition:
"to suck it up (and tough it out)"
to accept whatever calamity, pain, suffering, anguish or whatever unpleasantness is occurring (and stoically endure it)
Synonyms:
aloof, apathetic, be forced, bow to fate, calm, cool, cross the Rubicon, detached, dispassionate, endure, enduring, indifferent, indomitable, face the music, have no choice, know no alternative, leap into the breach, long-suffering, patient, pay the piper, resigned, take it, stoic, stolid, unflappable, unmovable