1.if you slip, your feet slide accidentally and you lose your balance or fall over; if something that is moving around slips, it fails to stay firmly on a surface; if something that you are holding or wearing slips, it falls from your hands, or it falls from position; to become free, or to no longer be held by something
2.to go somewhere, especially quickly and quietly without people noticing you or stopping you
3.to slide something into a place or position; to put something somewhere, or to give something to someone quickly and quietly, so that other people do not see what you are doing
4.to become gradually less strong or good, or to move into a worse condition
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