(~s, ~ing, ~ed)
1.
If someone ~s somewhere, they wait there secretly so that they cannot be seen, usually because they intend to do something bad.
He thought he saw someone ~ing above the chamber during the address.
VERB: V
2.
If something such as a danger, doubt, or fear ~s somewhere, it exists but is not obvious or easily recognized.
Hidden dangers ~ in every family saloon car...
Around every corner ~ed doubt and uncertainty.
VERB: V, V