千斤

qiānjīn
  1. a loop used as a nut on erhu and other huqin instruments
  2. of great responsibility
  3. one thousand catties
  4. pawl
  5. short for 千斤頂／千斤顶 (qiānjīndǐng, “lifting jack”)
  6. very heavy
  7. very important

Wiktionary

Entry Composition

=1 千 qiān thousand
=1 千 qiān used in 秋千 qiūqiān
2 斤 jīn
  1. catty
  2. (PRC) weight equal to 500 g
  3. (Tw) weight equal to 600 g
  4. (HK, Malaysia, Singapore) slightly over 604 g

Containing this entry

千斤顶 qiānjīndǐng jack (for lifting weight)
四两拨千斤 sìliǎngbōqiānjīn
  1. lit. four ounces can move a thousand catties (idiom)
  2. fig. to achieve much with little effort
秤砣虽小压千斤 chèngtuósuīxiǎoyāqiānjīn
  1. although small, a steelyard weight may tip a hundred pounds (idiom)
  2. apparently insignificant details can have a large impact
  3. for want of a nail the battle was lost