田-7 当 [當]Ⅰ(动) ① equal ②ought to; should ③work as; be serve as ④ bear; accept; deserve ⑤ manage; be in charge of ⑥ equal Ⅱ(介) ① in sb’s presence; to sb’s face ② just at (a certain time or place)

当     当是形声字。田为形符；尚为声符。《说文》注：“田相值也。从田，尚声。”当义为田地与田地之值相对等。引申相对、相称、对着、向着、阻挡、抵挡。又引申担任、充当、承担、承受、掌管、主持、应当等。当又作介词用。

dāng

当 [當]Ⅰ(动) ① equal ②ought to; should ③work as; be serve as ④ bear; accept; deserve ⑤ manage; be in charge of ⑥ equal Ⅱ(介) ① in sb’s presence; to sb’s face ② just at (a certain time or place)