stale

Concise Oxford English Dictionary © 2008 Oxford University Press:
stale1

▶adjective (staler, stalest)

• 1 (of food) no longer fresh or pleasant to eat.

• 2 no longer new and interesting.

  ■ (of a person) no longer performing well because of having done something for too long.

• 3 (of a cheque or legal claim) invalid because out of date.

▶verb make or become stale.

– derivatives
stalely adverb,
staleness noun.

– origin ME (describing beer in the sense ‘clear from long standing’): prob. from Anglo-Norman Fr. and OFr., from estaler ‘to halt’; cf. stall.

Concise Oxford English Dictionary © 2008 Oxford University Press:
stale2

▶verb (of a horse or cow) urinate.

– origin ME: perh. from OFr. estaler ‘come to a stand, halt’ (cf. stale1).