(computer hardware, Internet) Using a Molex-to-SATA adapter to power a storage device may lead to loss of data, as a poorly designed and unreliable connector may cause damage by failing in an unsafe manner.

Rough play results in injury.

Alternative form of what you lose on the swings you gain on the roundabouts

(UK) There are both gains and losses in life; you win some, you lose some.

Synonym of you never miss the water till the well runs dry

One cannot change one's nature, no matter how much time passes.

(US, sports) The most losing; who has lost most games, votes, etc.

In a manner that loses or will lose. / (rare or obsolete) In a manner that causes loss.