refrain meaning
EN
[ɹɪˈfɹeɪn] [-eɪn] 
US WRefrain
- A refrain (from Vulgar Latin refringere, "to repeat", and later from Old French refraindre) is the line or lines that are repeated in music or in verse; the "chorus" of a song.
- The use of refrains is particularly associated with where the verse-chorus-verse song structure typically places a refrain in almost every song.
FR refrain 
- NounPLrefrainsPREré-SUF-ain
- VerbSGrefrainsPRrefrainingPT, PPrefrained
- (transitive, archaic) To hold back, to restrain (someone or something).
- (reflexive, archaic) To show restraint; to hold oneself back.
- (transitive, now rare) To repress (a desire, emotion etc.); to check or curb.
- (intransitive) To stop oneself from some action or interference; to abstain.
- (transitive, now rare, regional) To abstain from (food or drink).
- (transitive, archaic) To hold back, to restrain (someone or something).
- More Examples
- Used in the Middle of Sentence
- As first, the timing and seasoning of knowledges; as with what to initiate them, and from what for a time to refrain them.
- Used in the Middle of Sentence
Definition of refrain in English Dictionary
- Part-of-Speech Hierarchy
- Nouns
- Countable nouns
- Countable nouns
- Verbs
- Intransitive verbs
- Transitive verbs
- Intransitive verbs
- Nouns
Source: Wiktionary
Grammatically, this word "refrain" is a noun, more specifically, a countable noun. It's also a verb, more specifically, an intransitive verb and a transitive verb.