凑成còuchéngMeanings1. to put together2. to make up (a set)3. to round up (a number to a convenient multiple)4. resulting in...Characters used凑to gather together成to succeedExamples1你nǐ需要xūyào两liǎng个gè才cái能néng凑成còuchéng一对yīduì。You need two to make a pair.