If any line of effect between the origin square and the target is blocked, the target has cover.

如果从原点方格到目标的任何一条效应线被阻断，那么目标就有了掩护。

youdao

If Royal walked away, and an alternative tie-up with Carnival deal was then blocked by regulators, the company would be back to square one, probably leaving shareholders nursing hefty losses.

BBC: Valentine test for Princess tie-up