Wall Street was poised to open with healthy gains on Friday, but nowhere near enough to make up for the losses that have piled up in recent weeks as anxious investors flee for safer holdings in the midst of an escalating U.

Stocks jumped to a big early gain, gave it back, and then went up again as a volatile week for the market rolls on.

A 10% drop is a big enough deal that professional investors have a name for it — a “correction” — and the S&P 500’s 1.4% slide on Thursday sent the index to its first si