to betray or sacrifice someone to save yourself
为了自保而背叛或牺牲某人 (weile zibao er beipan huo xiseng mouren)
"He threw his colleague under the bus to avoid getting fired."
"他为了避免被解雇，出卖了同事。" (ta weile bimian bei jiekou chumaile tongshi)
to do something uncertain, trusting that it will succeed
to cause a problem that stops progress
to know someone very well
not allowed or beyond acceptable limits
to trust your instincts when making a decision
to make sure income and expenses are equal
