gut check

check and balance

Provide mutual oversight and limitation by independent organizations in order to prevent abuses of power.

check is in the mail

A common excuse used by debtors to put off creditors.

check the math

To verify the source or accuracy of something.

check through

To permit someone to continue onward, e.g. through a security checkpoint, after verifying their identity, tickets, etc.

go with one's gut

To trust or follow an intuition or instinct, as opposed to an opinion based on a logical analysis.

gut factor

The emotional dimension of decision-making. A person's subjective (often almost visceral) feelings about what is right or wrong, good or bad.

gut feeling

An instinct or intuition; an immediate or basic feeling or reaction without a logical rationale.

gut out

To endure stoically.