Senses
底线/ 底線 bottom line
The minimum conditions or the limit of what one is prepared to accept; the final degree of tolerance.
底线/ 底線 baseline
The end line or boundary at both ends of a sports court or field.
底线/ 底線 planted agent
An informer, spy, or plant within an organization; someone working undercover in enemy territory.
底线/ 底線 underthread
(sewing) The thread that comes from the bobbin on a sewing machine.
底线/ 底線 underline
A line drawn under a piece of text to emphasize it or indicate a hyperlink