Hole-and-corner and Under cover

Hole-and-corner adjective - Undertaken or done so as to escape being observed or known by others.

Under cover and hole-and-corner are semantically related In some cases you can use "Under cover" instead an adjective phrase "Hole-and-corner".

Hole-and-corner and under cover are semantically related in secret topic. Sometimes you can use "Hole-and-corner" instead an adjective phrase "Under cover", if it concerns topics such as sneaky.