柯林斯詞典解釋：

hang

back(hanging,

hanged, hangs)

PHRASAL VERB

If you hang back, you move or stay slightly behind a person

or group, usually because you are shy or nervous about something. (常指因害羞或緊張) 退縮;

躊躇不前

例：

I saw him step forward momentarily but then hang back,

nervously massaging his hands.

我看到他向前走了片刻，然後卻退縮不前，忐忑不安地搓著手。

2. PHRASAL VERB

If a person or organization hangs back, they do not do

something immediately. 拖延

例：

They will then hang back on closing the deal.

他們接著會拖延成交這筆生意。

我覺得這二第二種解釋合適一點，可能是說，我先不去做某件事，跟andy待一會再說。

沒語境我也只能瞎猜了。你再看看前後文應該容易明白。