For "to lie down" (as in sleep):
* படு (paḍu): This is the most common word for "to lie down."
* படுத்துக் கொள்ள (paḍuttuk kolla): This is a more formal way of saying "to lie down."
For "to tell a lie":
* பொய் சொல் (poy sol): This means "to tell a lie."
* கூற (kooru): This means "to say" and can be used to refer to telling a lie in a specific context.
* ஏமாற்று (ēmāṭṭu): This means "to deceive" and can be used to refer to telling a lie to mislead someone.
For "a lie" as a noun:
* பொய் (poy): This is the most common word for "a lie."
The specific word you use will depend on the context of the sentence.