1. (noun) a note that alternates rapidly with another note a semitone above it

• shake

2. (verb) sing or play with trills, alternating with the half note above or below

• quaver
• warble

1. (noun) a note that alternates rapidly with another note a semitone above it

• musical note
• note
• tone

2. (noun) the articulation of a consonant (especially the consonant r') with a rapid flutter of the tongue against the palate or uvula

• articulation

3. (verb) pronounce with a trill, of the phoneme r'

• articulate
• enounce
• enunciate
• pronounce
• say
• sound out

4. (verb) sing or play with trills, alternating with the half note above or below

• sing

1. (noun) a note that alternates rapidly with another note a semitone above it

• quaver
• warble

2. (verb) sing or play with trills, alternating with the half note above or below

• eighth note
• quaver
• shake
• warbler