suck it up

Probably a variation of the expression "suck up your chest", meaning roughly "compose yourself, bear your troubles, stand tall, and proceed".

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suck it up (third-person singular simple present sucks it up, present participle sucking it up, simple past and past participle sucked it up)

1. (idiomatic) To put up with something; to deal with something, such as pain or misfortune, without complaining.
   • 2001 January 8, Ben Marcus, “Graded By My Students”, in Time:

     Some students suck it up and meet the challenge. Others look around wildly for someone to blame.