to sting or bite (of mosquito, bee etc) / to say repeatedly / to urge insistently / to ask repeatedly / to stick to a point / (onom.) tinkling or jingling sound
叮
=
丁
+
口
:
In front of the engine ((e)ng1), Dorothy Gale (di) is celebrating the anniversary of the witche's death by repeatedly (叮) stinging (叮) a mandarin (口) with a nail (丁) and singing "叮咚 the witch is dead!"
to be / to act as / manage / withstand / when / during / ought / should / match equally / equal / same / obstruct / just at (a time or place) / on the spot / right / just at
当
=
小
+
彐
:
This character looks like an angry pitbull. 小 forms the eyes and maybe nose, and 彐 are the dangerous teeth.
当
=
小
+
彐
:
Don Quixote opposes a dangerous pit bull in front of the anglepod, and he tries to calm him down with a daisy.
lit. if you tap a half-empty bottle it makes a sound (idiom) / fig. empty vessels make the most noise / one who has a little knowledge likes to show off, but one who is truly knowledgeable is modest