# Brink vs. Cusp — What's the Difference?

## Definitions

#### Brink➦

The upper edge of a steep or vertical slope
The brink of a cliff.

#### Cusp➦

A point or pointed end.

#### Brink➦

The margin of land bordering a body of water.

#### Cusp➦

A pointed or rounded projection on the chewing surface of a tooth.

#### Brink➦

The point at which something is likely to begin; the verge
"Time and again the monarchs and statesmen of Europe approached the brink of conflict" (W. Bruce Lincoln).

#### Cusp➦

A triangular fold or flap of a heart valve.

#### Brink➦

The edge, margin, or border of a steep place, as of a precipice; a bank or edge.
The brink of a river

#### Cusp➦

(Mathematics) A point at which a curve crosses itself and at which the two tangents to the curve coincide.

#### Brink➦

(figurative) The edge or border.
The brink of success

#### Cusp➦

(Architecture) The point of intersection of two ornamental arcs or curves, such as the inner points of a trefoil.

#### Brink➦

The edge, margin, or border of a steep place, as of a precipice; a bank or edge, as of a river or pit; a verge; a border; as, the brink of a chasm. Also Fig.
The plashy brink of weedy lake.

#### Cusp➦

(Astronomy) Either point of a crescent moon.

#### Brink➦

A region marking a boundary

#### Cusp➦

The boundary between two astrological signs or Zodiacal constellations.

#### Brink➦

The edge of a steep place

#### Cusp➦

A sharp point or pointed end.

#### Brink➦

The limit beyond which something happens or changes;
On the verge of tears
On the brink of bankruptcy

#### Cusp➦

(figuratively) An important moment when a decision is made that will determine future events.

#### Cusp➦

(geometry) A point of a curve where the curve is continuous but has no derivative, but such that it has a derivative at every nearby point.

#### Cusp➦

(architecture) A point made by the intersection of two curved lines or curved structures, a common motif in Gothic architecture.

#### Cusp➦

(astrology) A boundary between zodiacal signs and houses.

#### Cusp➦

(dentistry) Any of the pointed parts of a canine tooth or molar.

#### Cusp➦

(anatomy) A flap of a valve of a heart or blood vessel.

#### Cusp➦

A point of transition.

#### Cusp➦

A triangular protection from the intrados of an arch, or from an inner curve of tracery.

#### Cusp➦

The beginning or first entrance of any house in the calculations of nativities, etc.

#### Cusp➦

The point or horn of the crescent moon or other crescent-shaped luminary.

#### Cusp➦

A multiple point of a curve at which two or more branches of the curve have a common tangent.

#### Cusp➦

A prominence or point, especially on the crown of a tooth.

#### Cusp➦

A sharp and rigid point.

#### Cusp➦

To furnish with a cusp or cusps.

#### Cusp➦

Point formed by two intersecting arcs (as from the intrados of a Gothic arch)

#### Cusp➦

A thin triangular flap of a heart valve

#### Cusp➦

Small elevation on the grinding surface of a tooth