This is the 387th most frequent Thai word.
ลง
The Thai word "ลง" means "down" or "to go down/descend."
The word 'ลง' in this context means 'to sign' as part of the phrase 'ลงนาม'.
เขาลงนามในสัญญาที่สำคัญมาก
He signed a very important contract.
The word 'ลง' here signifies the action 'to board' or 'step into', used when entering certain modes of transport.
นักท่องเที่ยวลงเรือเพื่อชมวิวแม่น้ำ
Tourists boarded the boat to enjoy the river view.
In this sentence, 'ลง' is used to indicate a decrease or reduction, as seen in 'เย็นลง', meaning 'become cooler'.