NOUN (3)

1. a relatively insignificant position from which future progress might be made;
- Example: "American diplomacy provided a toehold on which to proceed toward peace talks"
- Example: "his father gave him a toehold in the oil business"

2. a small foothold used in climbing;

3. a wrestling hold in which the toe is held and the leg is twisted against the joints;

WordNet (r) 3.0 (2006):

toehold
    n 1: a relatively insignificant position from which future
         progress might be made; "American diplomacy provided a
         toehold on which to proceed toward peace talks"; "his
         father gave him a toehold in the oil business"
    2: a small foothold used in climbing
    3: a wrestling hold in which the toe is held and the leg is
       twisted against the joints