柯林斯词典解释：
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.(常指因害羞或紧张) 退缩;
踌躇不前
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,然后却退缩不前,忐忑不安地搓着手.
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.
他们接着会拖延成交这笔生意.
我觉得这二第二种解释合适一点,可能是说,我先不去做某件事,跟andy待一会再说.
没语境我也只能瞎猜了.你再看看前后文应该容易明白.
