【go fishing】 —(U.S. sl., also: be on a fishing expedition) undertake a search for facts (especially using improper methods):

• When you’re involved in litigation, you’re almost inviting the other side to 【go fishing】 through your ancient records.

【gone fishing】 —(U.S. sl.)

1. said of a person unaccountably absent from duty:

• President Bush hung out the “ 【gone fishing】 ” sign at the White House on Friday and headed for a birthday weekend.

2. be not in touch with the real world; have no idea what is going on:

• This is not the first time he has “ 【gone fishing】 ” in a big match. Even Liam Brady would have done better playing last night.