(un′dər) prep.
1. Beneath, so as to have something directly above; covered by: layer under layer.
2. In a place lower than; at the foot or bottom of: under the hill.
3. Beneath the shelter of: under the paternal roof.
4. Beneath the concealment, guise, or assumption of: under a false name.
5. Less than in number, degree, age, value, or amount: under 10 tons.
6. Inferior to in quality, character, or rank.
7. Beneath the domination of; owing allegiance to; subordinate or subservient to: under the Nazi flag.
8. Subject to the guidance, tutorship, or direction of: He studied under Mendelssohn.
9. Subject to the moral obligation of: a statement under oath; subject to the sanction of; with the liability or certainty of incurring: under penalty of the law.
10. Subject to the influence or pressure of: under the circumstances; swayed or impelled by: under fear of death.
11. Driven or propelled by: under sail, under steam.
12. Included in the group or class of; found in the matter titled or headed: See under History.
13. Being the subject of: under medical treatment.
14. During the period of; in the reign of; pending the administration of.
15. By virtue of; authorized, substantiated, attested, or warranted by: under his own signature.
16. In conformity to or in accordance with; having regard to.
17. Planted or sowed with: an acre under wheat. See synonyms under BENEATH.
—adverb
1. In or into a position below something; underneath.
2. In or into an inferior or subordinate degree or rank.
3. So as to be covered or hidden; in or into concealment.
4. Less than the required or appointed amount.
—to go under To fail or collapse, as a business venture.
—adjective
1. Situated or moving under something else; lower or lowermost: an under layer.
2. Zool. Ventral: the under side of a rattlesnake.
3. Subordinate; lower in rank or authority.
4. Insufficient; less than usual, standard, or prescribed.
5. Held in subjection or restraint: used predicatively: Hold your emotions under. [OE]

1. Below in position; situated or directed beneath; on the underside; as in:

6. Subdued; hidden; as in: