剃头挑子一头热

1. • lit. only one end of the barber's pole is hot (idiom)
2. • fig. one-sided enthusiasm
3. • one party is interested, but the other, not so much
4. • (Note: In former days, street barbers carried their equipment on a pole, with tools and a stool at one end and a brazier at the other.)

Character by character

• 剃(tì)shave
• 头(tóu)head
• 挑(tiāo)carry on a shoulder pole
• 子(zi)noun suffix, as in 椅子 yǐzi "chair"
• 一(yī)one
• 头(tóu)head
• 热(rè)warm up