Webster's Revised Unabridged Dictionary · 1913

Bless

Bless ({not transcribed}) , transitive verb

[Old English blessien, bletsen, Anglo-Saxon bletsian, bledsian, bloedsian, from blōd blood; prob. originally to consecrate by sprinkling with blood. See Blood.]

1.
To make or pronounce holy; to consecrate
And God blessed the seventh day, and sanctified it. — Gen. ii. 3
2.
To make happy, blithesome, or joyous; to confer prosperity or happiness upon; to grant divine favor to.
The quality of mercy is... twice blest; It blesseth him that gives and him that takes. — Shakespeare
It hath pleased thee to bless the house of thy servant, that it may continue forever before thee. — 1 Chron. xvii. 27 (R. V. )
3.
To express a wish or prayer for the happiness of; to invoke a blessing upon; -- applied to persons.
Bless them which persecute you. — Rom. xii. 14
4.
To invoke or confer beneficial attributes or qualities upon; to invoke or confer a blessing on, -- as on food.
Then he took the five loaves and the two fishes, and looking up to heaven, he blessed them. — Luke ix. 16
5.
To make the sign of the cross upon; to cross (one's self). [Archaic] — Holinshed
6.
To guard; to keep; to protect. [Obsolete]
7.
To praise, or glorify; to extol for excellences.
Bless the Lord, O my soul: and all that is within me, bless his holy name. — Bible (KJV) - Psalm ciii. 1
8.
To esteem or account happy; to felicitate.
The nations shall bless themselves in him. — Jer. iv. 3
9.
To wave; to brandish. [Obsolete]
And burning blades about their heads do bless. — Spenser
Round his armed head his trenchant blade he blest. — Fairfax
To bless the doors from nightly harm. — Milton

This is an old sense of the word, supposed by Johnson, Nares, and others, to have been derived from the old rite of blessing a field by directing the hands to all parts of it. “In drawing [their bow] some fetch such a compass as though they would turn about and bless all the field.”