Let oneself go and Plunk down

Plunk down and let oneself go are semantically related. In some cases you can use "Plunk down" instead a verb phrase "Let oneself go".

Plunk down verb - Set (something or oneself) down with or as if with a noise.

Let oneself go and plunk down are semantically related. Sometimes you can use "Let oneself go" instead a verb "Plunk down".