It implies:
* Acceptance: You are acknowledging that the situation is unavoidable and that you need to deal with it.
* Resilience: You are showing strength and determination by not letting the situation defeat you.
* Toughness: It often suggests that you are not letting your emotions get the best of you, even though you might be feeling frustrated or upset.
Example:
"I know you're tired, but we have to finish this project tonight. Just suck it up and get it done."
Note:
While "suck it up" can be used to encourage someone to persevere, it can also come across as insensitive or dismissive. It's important to use the idiom with caution and consider the context and the person you are speaking to.