酬 is a bound morpheme (b.f.) — it cannot stand alone as an independent word but appears as a component in compounds. Its core meanings include 'reward' or 'payment' (报酬 bàochóu, 酬劳 chóuláo), 'to fulfill' or 'to realize' (酬志 chóuzhì 'to realize one's ambition'), and 'friendly exchange' or 'social interaction' (应酬 yìngchóu 'social engagements', 酬酢 chóuzuò 'to exchange toasts'). The sense 'propose a toast' appears in 酬酢 and literary contexts. When you encounter 酬 in a compound, the surrounding word determines which sense is active.