long-standing

US /ˌlɔŋˈstæn.dɪŋ/

UK /ˌlɔŋˈstæn.dɪŋ/

1.

having existed for a long time

:

•

They have a long-standing friendship.

•

The company has a long-standing reputation for quality.

:

established enduring old traditional time-honored

:

stand standing stand by stand for stand-in long long on