1. To bear the weight of, especially from below.
2. To hold in position so as to keep from falling, sinking, or slipping.
3. To be capable of bearing; withstand: "His flaw'd heart . . . too weak the conflict to support" (Shakespeare).
4. To keep from weakening or failing; strengthen: The letter supported him in his grief.
5. To provide for or maintain, by supplying with money or necessities.
6. To furnish corroborating evidence for: New facts supported her story.
7. 1. To aid the cause, policy, or interests of: supported her in her election campaign.
   2. To argue in favor of; advocate: supported lower taxes.
8. To endure; tolerate: "At supper there was such a conflux of company that I could scarcely support the tumult" (Samuel Johnson).
9. To act in a secondary or subordinate role to (a leading performer).

1. 1. The act of supporting.
   2. The state of being supported.
2. One that supports.
3. Maintenance, as of a family, with the necessities of life.

Synonyms: These verbs mean to give aid or encouragement to a person or cause. Support is the most general: "the policy of Cromwell, who supported the growing power of France against the declining power of Spain" (William E.H. Lecky).
To uphold is to maintain or affirm in the face of a challenge or strong opposition: "The Declaration of Right upheld the principle of hereditary monarchy" (Edmund Burke).
Back suggests material or moral support intended to contribute to or assure success: The important medical research was backed by the federal government.
Advocate implies verbal support, often in the form of pleading or arguing: Scientists advocate a reduction in saturated fats in the human diet.
To champion is to fight for one that is under attack or is unable to act in its own behalf: "championed the government and defended the system of taxation" (Samuel Chew).