sip＝
【名】（飲み物のごく少量の）ひと口、ひとすすり
【動】少しずつ飲む、ちびちび飲む
One sip told me that the milk was sour.
He sipped the hot tea noisily.
【名】（飲み物のごく少量の）ひと口、ひとすすり
【動】少しずつ飲む、ちびちび飲む
One sip told me that the milk was sour.
He sipped the hot tea noisily.
a pat on the back(for)＝ほめること、称賛（のことば）
He deserves a pat on the back for a job well done.
He deserves a pat on the back for a job well done.
knack＝こつ、技巧
Flipping pancakes is easy once you get the knack of it.
（ホットケーキをさっと裏返すのは、１度こつを覚えれば簡単だ）
Flipping pancakes is easy once you get the knack of it.
（ホットケーキをさっと裏返すのは、１度こつを覚えれば簡単だ）