a sleepy drink or potion

Painstakingly negotiated agreements governed many aspects of international relations; the doctrine of pacta sunt servanda dictated that those agreements be obeyed.

I'm going to join a sports team.

This book reveals how drummers used the established drum kit when rock'n'roll first arrived, and how in the decades that followed players from D. J. Fontana with Elvis Presley to Police sticksman Stewart Copeland combined existing playing techniques to expand rock drumming.