In normal cases, the transaction fee added by the sender incentivizes Bitcoin miners to pick the the transaction and confirm it into Blockchain. However, if the fee is set too low, miners act reasonably and avoid picking up the low-fee transaction, thus the transaction may linger around unconfirmed for a long time. As a result, the receiver waits and waits and no confirmation of the fund is being received. The transaction is said to be stuck due to law fee.
This is a companion discussion topic for the original entry at http://www.bitcoin-en.com/accelerate-bitcoin-transaction.html