At a loss and Tongue-tied

At a loss adjective - Filled with bewilderment.

Tongue-tied and at a loss are semantically related. In some cases you can use "Tongue-tied" instead an adjective phrase "At a loss".

Tongue-tied adjective - Unable to express yourself clearly or fluently.

At a loss and tongue-tied are semantically related. Sometimes you can use "At a loss" instead an adjective phrase "Tongue-tied".