DANG -1

('dang' in the first tone)

There are 17 standard Chinese characters with a 'dang' pronunciation. For nine of them, 当 is the sound-determining component. In another three, 党 indicates the sound.

当 = just at

Inscription on Chinese train tickets:

限乘当日当次车 = xian(4) cheng(2) dang(1) ri(4) dang(1) ci(4) che(1) = Restricted to ride just at the day and just on the train number (indicated)