to fill / to satisfy / to fulfill / to act in place of / substitute / sufficient / full
充
=
亠
+
允
:
Mnemonic symbol: a charger for your mobile phone. Chantal Chicken (chu) has to charge her mobile phone, but the only charger (充) is outside in front of the engine ((e)ng1). Without any better option she waits outside in the cold wind for her phone to charge until she gets a runny nose (允). Lacking tissues she has to blow her nose into her beret (亠).
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.