// Widen the object by 0.1
transform.localScale += Vector3(0.1,0,0);

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        transform.localScale += new Vector3(0.1F, 0, 0);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        transform.localScale += Vector3(0.1F, 0, 0)