OUGHT
Etymology 1
Verb
ought
(obsolete) simple past tense of owe
Verb
ought
(auxiliary) Indicating duty or obligation.
(auxiliary) Indicating advisability or prudence.
(auxiliary) Indicating desirability.
(auxiliary) Indicating likelihood or probability.
Usage notes
• Ought is an auxiliary verb; it takes a following verb as its complement. This following verb may appear either as a full infinitive (such as “to go”) or a bare infinitive (such as simple “go”), depending on region and speaker; the same range of meanings is possible in either case. Additionally, it's possible for ought not to take any complement, in which case a verb complement is implied, as in, “You really ought to [do so].”
• The negative of ought is either ought not (to) or oughtn't (to) (yet oughtn't've: oughtn't *(to) have)
Synonyms
• should (In all senses)
Pronoun
ought
Alternative spelling of aught; anything
Adverb
ought (not comparable)
Alternative spelling of aught; at all, to any degree.
Noun
ought (plural oughts)
A statement of what ought to be the case as contrasted with what is the case.
Etymology 2
Noun
ought (plural oughts)
Alternative spelling of aught; cipher, zero, nought.
• Charles Dickens, Nicholas Nickleby
Anagrams
• tough
Source: Wiktionary
Ought, n. & adv.
Definition: See Aught.
Ought, imp., p. p., or auxiliary. Etym: [Orig. the preterit of the
verb to owe. OE. oughte, aughte, ahte, AS. ahte. sq. root110. See
Owe.]
1. Was or were under obligation to pay; owed. [Obs.]
This due obedience which they ought to the king. Tyndale.
The love and duty I long have ought you. Spelman.
[He] said . . . you ought him a thousand pound. Shak.
2. Owned; possessed. [Obs.]
The knight the which that castle ought. Spenser.
3. To be bound in duty or by moral obligation.
We then that are strong ought to bear the infirmities of the weak.
Rom. xv. 1.
4. To be necessary, fit, becoming, or expedient; to behoove; -- in
this sense formerly sometimes used impersonally or without a subject
expressed. "Well ought us work." Chaucer.
To speak of this as it ought, would ask a volume. Milton.
Ought not Christ to have suffered these things Luke xxiv. 26.
Note: Ought is now chiefly employed as an auxiliary verb, expressing
fitness, expediency, propriety, moral obligation, or the like, in the
action or state indicated by the principal verb.
Syn.
– Ought, Should. Both words imply obligation, but ought is the
stronger. Should may imply merely an obligation of propriety,
expendiency, etc.; ought denotes an obligation of duty.
Source: Webster’s Unabridged Dictionary 1913 Edition