Webster's Revised Unabridged Dictionary · 1913

Toot

Toot , intransitive verb

[Old English toten, Anglo-Saxon totian to project; hence, to peep out.]

1.
To stand out, or be prominent. [Obsolete] — Howell
2.
To peep; to look narrowly. [Obsolete] — Latimer
For birds in bushes tooting. — Spenser

Toot , transitive verb

To see; to spy. [Obsolete] — P. Plowman

Toot , intransitive verb

[Compare Dutch toeten to blow a horn, German tuten, Swedish tuta, Danish tude; probably of imitative origin.]

To blow or sound a horn; to make similar noise by contact of the tongue with the root of the upper teeth at the beginning and end of the sound; also, to give forth such a sound, as a horn when blown.
A tooting horn. — Howell
Tooting horns and rattling teams of mail coaches. — Thackeray

Toot , transitive verb

To cause to sound, as a horn, the note being modified at the beginning and end as if by pronouncing the letter t; to blow; to sound.