P Je50:2 :ܐܫܡܥܘ݁ ܘܠܐ ܬܬܟܣܘܢ‏ : sound out and do not hold back [=MT הַשְׁמִיעוּ אַל־תְּכַחֵדוּ]
See the entire entry for tks vb. to hold back, restrain