have another string to (one's) bow
To have an additional option, skill, or ability available to one. At least if you get your degree, you'll have another string to your bow if your football career is short-lived. At least you have another string to your bow, since you can always contact your aunt if the recruiter from HR doesn't call you back. Don't worry about me, I have another string to my bow—I can always pick up freelance work if I get laid off.
have more strings to (one's) bow
To have an additional option, skill, or ability available to one. At least if you get your degree, you'll have more strings to your bow if your football career is short-lived. A: "I'm thinking of taking up French." B: "Go for it! It's always good to have more strings to your bow." With all this varied job experience under my belt, I have more strings to my bow if this particular career path isn't to my liking.
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