ผูก = to tie มัด = to bind ผูกมัด = to bond first of all, a word 'ผูกพันธ์' doesn't exist (it's a commonly misspelled word). instead, it's 'ผูกพัน' that means : to be bonded to someone by deep relationship between lover or friend, have a strong feeling to someone due to deep relationship, times they've spent together, etc. also, the example sentence you've given here is quite odd due to they're old compound words and it's quite old way of saying that's not normally used in spoken language nowadays. (it's tended to be a poem language)