Hook

The hook is sports-betting slang for the half-point on a spread or total. A line of -3.5 is “three-and-a-hook” (or “three with the hook”). The phrase shows up most in NFL spread talk, where half-points around key numbers (3 and 7) are genuinely worth the juice cost to buy.

“With the hook” vs “without the hook”

If you bet a favorite at -7, you’re “without the hook” — the team can win by exactly 7 and your bet pushes (refund). If you bet at -7.5, you’re “with the hook” — you need a margin of 8 or more to win.

For underdogs, the inversion: +7 means a 7-point loss pushes; +7.5 means a 7-point loss wins for you (since 7 is less than 7.5).

Why the hook matters

The half-point isn’t just cosmetic. NFL margins cluster on key numbers — about 14-16% of NFL games end with a margin of exactly 3 and 9-10% end with a margin of exactly 7. A half-point that crosses a key number genuinely changes the win probability of your bet.

Crossing 3 (e.g., -2.5 vs -3) or crossing 7 (e.g., -6.5 vs -7) is worth more juice than crossing 5 or 11 because the underlying event probability is meaningfully different.

“Buying the hook”

Sportsbooks let you “buy” a hook — pay extra juice to move the line a half-point in your favor. Typical prices:

• Buying off 3 (going from -3 to -2.5): around -130 juice instead of -110
• Buying off 7 (going from -7 to -6.5): around -125 to -130
• Buying off non-key numbers (e.g., -10 to -9.5): around -115 to -120

For NFL bettors, buying off 3 is often roughly break-even — you avoid the push risk but pay enough juice that the EV gain is small. Buying off 7 has similar economics. Half-points away from key numbers usually aren’t worth buying.

Selling the hook

Some books let you sell a hook — accept a worse spread in exchange for better odds. Going from -7 to -7.5 (selling the hook on a favorite) might let you bet at +100 instead of -110. The math depends heavily on the underlying margin frequency: selling off 3 or 7 is usually a bad trade, selling off non-key numbers can be defensible.

Hooks on totals

Same concept on totals. “Over 47.5” is over 47 with the hook. “Over 48” is without — the game can land on exactly 48 and push. NFL totals around 41 / 44 / 51 cluster on whole numbers similarly to spreads.

Hooks across sports

• NFL: 3 and 7 are dominant; the hook is genuinely valuable.
• NBA: weaker key-number effects; hooks matter less.
• MLB / NHL / Soccer: 1 dominates; half-runs/half-goals aren’t a thing in standard markets.

The phrase “with the hook” is mostly an NFL betting tradition. Other sports use the same math but rarely the same vocabulary.