1 [count] : a long, thin rod that ends in a point and is often made of metal
There are spikes on top of the fence.
The climbers drove metal spikes into the ice.
a railroad spike [=a large nail used to attach rails to railroad ties]
2 [count] : a sudden, rapid increase in something
There's been a spike in traffic since the new grocery store opened.
a price spike
3 a [count] : a metal point attached to the bottom of shoes worn by athletes in some sports — usually plural
I need to replace the spikes on my golf shoes.
b spikes [plural] : shoes with metal points attached to the bottom
Baseball players usually wear spikes.
a pair of spikes
c spikes [plural] : women's shoes with high, thin heels
She wore (a pair of) spikes. [=spike heels]
4 [count] : a long, narrow group of flowers that grow on one stem
a spike of flowers = a flower spike